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TECHNICAL

SPECIFICATIONS

ALPHA SERIES USER MANUAL V1.0
DATE: 14/01/00 18:27

Alpha B1-15 / B1-18

SYSTEM SPECS

ALPHA B1-15

ALPHA B1-18

Frequency
Response [a]

Wideband: 42 Hz – 180 Hz ± 3 dB
Xover: 80 Hz – 190 Hz ± 3 dB

40 Hz – 230 Hz ± 3 dB

Usable Range @-
6dB [a]

39 Hz – 600 Hz

38 Hz – 600 Hz

Sensitivity 1W @
1m [b]

106 dB SPL

107 dB SPL Nominal

Peak SPL @ 1m
[b]

140 dB Peak

142 dB Peak

Nominal
Impedance

6 ohms (5.2 mini)

6 ohms (4.7 mini)

Recommended
Amplifiers

900 to 1200 Watts into 6 ohms

900 to 1400 Watts into 6 ohms

FEATURES

ALPHA B1-15

ALPHA B1-18

Components

1 x 15" (38 cm) 6 ohms
Folded Horn, Composite Curve

1 x 18" (46 cm) 6 ohms
Folded Horn, Composite Curve

Height x Width x
Depth

600 x 689 x 754 mm
(23 5/8" x 27 1/8 " x 29 11/16")

800 x 689 x 754 mm
(31.49" x 27 1/8 " x 29 11/16")

Shape

22.5° Trapezoid

Weight: Net

51 kg (112 Lb)
With wheel board: 58 kg (128 Lb)

69.9 kg (155 Lb)
With wheel board: 79 kg (175 Lb)

Connectors

2x 4 poles Speakon (In / Out)

1+ & 1- (Sub S2)
2+ & 2- (Bass B1)

Construction

Baltic Birch with Dark Grey carpeting, Structured Black coating painting finish also available.

Handles

2 Metal Bar Handles

4 Metal Bar Handles

Front Finish

Acoustic Foam on hex perforated steel grid (77% transparent)

Flying points

4 Flying Tracks on front (7 positions on

2° steps)

Top to bottom Steel Back plate

4 Flying Tracks on Back (Hinge fixing)

Internal top to bottom Steel links

Painted version without Flying Tracks

also available

Crossbow Flying System cabinet

Hardware:

Optional 4 Flying Tracks on Front

Internal top to bottom Steel links

Optional 2 Flying tracks on back (Hinge

fixing)

Painted version without Flying Tracks

also available

Fixed Installation

The X-BOW Flying Tracks can also receive standard Aircraft Flying Fittings.

As part of a policy of continual improvement, NEXO reserves the right to change specifications without notice.
[a]

Response Curves and Data: Anechoic Far Field above 200 Hz, Half-space Anechoic below 200 Hz.

Usable Range Data: Frequency Response Capability with TD crossover slopes removed.

[b]

Sensitivity & Peak SPL: will depend on spectral distribution. Measured with band limited Pink Noise.

Refers to the spe/- 3 dB range. Data are for S Pro recommended amplifier combinations.

Содержание Alpha EF

Страница 1: ...ALPHA SERIES Alpha M3 M8 Alpha Em EF B1 18 B1 15 S2 Sub bass User Manual ...

Страница 2: ...ARRAYS SOME BASIC RULES 11 ALPHA S2 PLACEMENT 11 SPL VERSUS FREQUENCY 11 SPL VERSUS DISTANCE 11 DIRECTIVITY COVERAGE 14 AMPLIFIERS 16 POWER 16 CURRENT RATING 16 AMPLIFIER GAINS 16 GAIN VALUE 17 ADVANCED PROTECTIONS 17 PASSIVE CROSSOVER FUSES 18 TECHNICAL SPECIFICATIONS 19 ALPHA S2 19 ALPHA B1 15 B1 18 20 ALPHA M3 M8 21 ALPHA EM EF 22 DIRECTIVITY TABLES 23 CURVES 24 ALPHA S2 24 ALPHA B1 18 24 ALPHA...

Страница 3: ...18 inch driver frequency response ranges from 40 Hz up to 200 Hz The Mid high M3 M8 are concentric horn cabinets dedicated to the 200 Hz 20 kHz frequency range reproduction the MF range is handled by two exponential horn loaded 10 inch drivers whose response is optimised by two Nexo designed phase plugs the HF range is handled by one constant directivity horn loaded two inch Neodymium driver M3 co...

Страница 4: ...1 15 B1 18 M3 M8 AlphaE TDcontroller for use with Alpha B1 18 EM EF This manual will only refer to the NX241 TDcontroller Please remember that the NX241 Digital TDcontroller is a software based product for which regular updates will be published Please consult the NEXO web site for the latest software releases The X BOW flying system The design of the X BOW flying system has been optimised for the...

Страница 5: ... at the loudspeaker end See Connections Diagrams at the end of this manual NB The Alpha S2 back panel features only one 4 pin SPEAKON connector in order to prevent accidental parallel connection very few amplifiers are able to drive such low impedance loads at the required power level CONNECTOR S2 B1 15 B1 18 M3 M8 EM EF 1 In Out VLF To VLF S2 To VLF S2 To VLF S2 SP4 1 2 Not connected In Out LF B1...

Страница 6: ...ries loudspeakers are equipped with steel anchor plates that can be fitted with NEXO X BOW flying accessories The X BOW Flying Manual must be thoroughly read before flying the system The following points are designed to remind the user of safe practice when flying the X BOW system They cannot address every possible circumstance in which the system might be deployed therefore the user must always a...

Страница 7: ...cess Ensure that the system is secure and prevented from pivoting about the motor hoist Avoid any form of dynamic loading to the assembly NEVER attach any item to the X BOW other than the NEXO X BOW accessories When flying outdoor systems ensure that the system is not exposed to wind or snow loads and is protected from rainfall The X BOW requires regular inspection and testing by a competent test ...

Страница 8: ... floor For outdoor systems ensure that that the system is protected from wind forces which might cause the ground stack to become unstable Wind forces can be huge especially upon large systems and should never be underestimated Observe meteorological forecasts calculate the likely effect upon the system prior to erection and ensure that the system is secured appropriately Take care when stacking c...

Страница 9: ...tion Alpha Series ALPHATD B1 M3 Configure Input A to drive a 3 Way Alpha System ALPHATD S2 B1 M3 SubTD S2 63Hz Configure Input A to drive a 4 Way Alpha System ALPHATD S2 B1 M3 SubTD S2 80Hz Configure Input A to drive a 4 Way Alpha System ALPHATD S2 B1 M3 S2 63Hz AUX inB Configures Input B right to drive the SUB channel independently ALPHATD S2 B1 M3 S2 80Hz AUX inB Configures Input B right to driv...

Страница 10: ...her components have been wired and are operating correctly This is particularly important for the amplifiers and the TDcontroller It is a good practice to turn down all the amplifier gains before connecting the cabinets and then turn them up again individually with a medium level music source fed into the system The sense LEDs of the corresponding TDcontroller channel should light up accordingly T...

Страница 11: ...o the size of the cabinets speakers set close to each other will always radiate in phase The gain in sound pressure level LGSPL will be of 6 dB per doubling i e if n Alpha S2 or B1 are installed LGSPL 20Hz 100Hz 20 log10 n In the mid frequency range the gain depends on the configuration of the array and will range from 3 to 6 dB per doubling i e for n Alpha M3 M8 EM or EF 10 log10 n LGSPL 100Hz 1k...

Страница 12: ...ll be decreasing by 6 dB when doubling the distance Straight Vertical Array long throw Some open air applications might require loud level on a wide frequency range at a long distance It is then recommended to stack a large number of Alpha M3 M8 EM vertically Up to a determined distance function of the frequency and the height of the stack the sound wave is cylindrical 3dB 2d it becomes progressiv...

Страница 13: ...ture At 20 C dB loss meter Up to 1 kHz 2 kHz 4 kHz 8 kHz 16 kHz RH 20 0 0 02 0 06 0 20 0 66 RH 50 0 0 01 0 03 0 08 0 27 RH 80 0 0 00 0 02 0 05 0 17 Air absorption over a 50m distance RH 20 50 80 At RH 50 dB loss meter Up to 1 kHz 2 kHz 4 kHz 8 kHz 16 kHz 10 C 0 0 01 0 04 0 13 0 43 20 C 0 0 01 0 03 0 08 0 27 30 C 0 0 01 0 02 0 06 0 19 20 100 1k 10k 20k FREQ Hz 40 00 30 00 20 00 10 00 0 0 10 000 LEV...

Страница 14: ...between sources generates a path length difference between the two signals that is nil on axis and increases with the listening angle If this path length difference increases to half the wavelength in a specific direction the two signals will cancel in that direction This phenomenon is often described as interference Resulting directivity At low frequencies because wavelength is much larger than t...

Страница 15: ...er than large listening angles although the Alpha M3 is a high Q cabinet 4 boxes are enough to cover a 140 horizontal plane Therefore large arrays will usually assemble cabinets at less than their nominal coverage angle Measurements and simulations show that when using a large amount of cabinets the individual behaviour of a cabinet will determine the roll off on the limits of the coverage zone an...

Страница 16: ...er starting this test Amplifier gains Technical knowledge on the amplifiers to be used with the system is essential This data is the key to the correct alignment of the system It is especially important to know the gain of all amplifiers used in your set up The tolerance shall be about 0 5 dB In practice this can be difficult to achieve because Some amplifier brands have an identical input sensiti...

Страница 17: ...ely low and quite common amongst amplifier manufacturers This gain setting improves signal to noise ratio and allows all preceding electronic equipment including the TDcontroller to operate at optimum level Remember that using a high gain amplifier will proportionally raise the noise floor by the same amount Advanced protections Some high end amplifiers may have some advanced functions similar to ...

Страница 18: ...fuse is checked at regular service intervals and especially when replacing any loudspeaker components If the fuse fails it will not prevent the cabinet from functioning but should the cabinets be operated in this condition the audio quality will be seriously degraded Failure to replace a defective fuse will cause a difference in audio quality between fully operational cabinets and those with defec...

Страница 19: ...d Black coating painting finish also available Handles 4 Metal Bar Handles Front Finish Acoustic Foam on hex perforated steel grid 77 transparent Flying points 4 Flying Tracks on front 7 positions on 2 steps Top to bottom Steel Back plate 2 Flying Tracks on Back Hinge fixing Internal top to bottom Steel links Painted version without Flying Tracks also available Fixed Installation The X BOW Flying ...

Страница 20: ...ing Structured Black coating painting finish also available Handles 2 Metal Bar Handles 4 Metal Bar Handles Front Finish Acoustic Foam on hex perforated steel grid 77 transparent Flying points 4 Flying Tracks on front 7 positions on 2 steps Top to bottom Steel Back plate 4 Flying Tracks on Back Hinge fixing Internal top to bottom Steel links Painted version without Flying Tracks also available Cro...

Страница 21: ...b S2 2 2 Bass B1 3 3 MF 4 4 HF Connectors 1 x 4 poles Speakon to B1 S2 1 1 Sub S2 2 2 Bass B1 Construction Baltic Birch with Dark Grey carpeting Structured Black coating painting finish also available Handles 2 Metal Bar Handles Front Finish Acoustic Foam on hex perforated steel grid 77 transparent Flying points 4 Flying Tracks on front 7 positions on 2 steps Top to bottom Steel Back plate 4 Flyin...

Страница 22: ...99 Lb 98 kg 209 Lb With wheel board 105 kg 231 Lb Connectors 2 x 8 poles Speakon In Out 1 1 Sub bass S2 2 2 Bass B1 3 3 MF HF 4 4 NC 1 x 4 poles Speakon to B1 S2 1 1 Sub bass S2 2 2 Bass B1 Construction Baltic Birch with Dark Grey carpeting Structured Black coating painting finish also available Handles 2 Metal Bar Handles 4 Metal Bar Handles Front Finish Acoustic Foam on hex perforated steel grid...

Страница 23: ... 0 0 1 5 5 5 9 8 11 5 12 5 13 8 15 3 17 0 18 8 19 5 21 0 22 0 22 3 22 0 20 0 20 8 17 5 16 3 B1 M8 vert 0 0 1 8 6 5 11 0 11 5 12 0 13 3 15 0 16 5 17 8 18 5 20 0 21 0 21 3 21 8 21 5 20 5 19 5 16 3 EM EF hor 0 0 2 0 6 3 9 8 9 5 9 5 10 3 11 3 12 5 13 5 14 3 15 3 16 5 17 5 18 8 17 3 18 8 19 0 17 0 EM EF vert 0 0 0 8 2 5 5 0 8 0 10 8 13 0 15 3 17 5 19 3 20 3 21 0 21 5 22 0 23 0 23 0 21 3 19 0 17 0 2000 ...

Страница 24: ...0 50 Impedance Alpha B1 18 Ohm Figure 4 Impedance Ohms Alpha B1 15 30 100 1k 10k 20k 30 00 20 00 10 00 0 0 10 000 On Axis Response Alpha B1 15 With AlphaTD Controller Overlap X over Figure 5 Frequency Response with Alpha TDcontroller dB Black Overlap Mode Grey X Over mode 10 100 1k 10k 2 10 50 Impedance Alpha B1 15 Ohm Figure 6 Impedance Ohms Frequency Response Curves Anechoic Far Field above 200 ...

Страница 25: ...le Alpha M3 Degree Figure 10 Nominal Coverage 6 dB Degrees 100 1k 10k 20k 30 00 20 00 10 00 0 0 10 000 Horizontal Off Axis Response Alpha M3 dB Figure 11 Horizontal Off Axis Frequency Response 10 20 30 100 1k 10k 20k 30 00 20 00 10 00 0 0 10 000 Vertical Off Axis Response Alpha M3 dB Figure 12 Vertical Off Axis Frequency Response 10 20 30 Frequency Response Curves Anechoic Far Field above 200 Hz H...

Страница 26: ...0 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180...

Страница 27: ... 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 ...

Страница 28: ...gle Alpha M8 Degree Figure 16 Nominal Coverage 6 dB Degrees 100 1k 10k 20k 30 00 20 00 10 00 0 0 10 000 Horizontal Off Axis Response Alpha M8 dB Figure 17 Horizontal Off Axis Frequency Response 10 20 30 100 1k 10k 20k 30 00 20 00 10 00 0 0 10 000 Vertical Off Axis Response Alpha M8 dB Figure 18 Vertical Off Axis Frequency Response 10 20 30 Frequency Response Curves Anechoic Far Field above 200 Hz ...

Страница 29: ...0 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180...

Страница 30: ... 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 ...

Страница 31: ... EM dB Figure 23 Horizontal Off Axis Frequency Response 10 20 30 100 1k 10k 20k 30 00 20 00 10 00 0 0 10 000 Vertical Off Axis Response Alpha EM dB Figure 24 Vertical Off Axis Frequency Response 10 20 30 Alpha EF 30 100 1k 10k 20k 30 00 20 00 10 00 0 0 10 000 On Axis Response Alpha EF With AlphaETD Controller dB Figure 25 Frequency Response with AlphaE TDcontroller dB 20 100 1k 10k 20k 2 10 50 Imp...

Страница 32: ...0 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180...

Страница 33: ... 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 210 240 270 300 330 0 30 60 90 120 150 180 ...

Страница 34: ...54 29 11 16 762 30 889 35 754 29 11 16 22 5 688 77 27 1 8 762 30 889 35 600 23 5 8 22 5 754 29 11 16 688 77 27 1 8 22 5 754 29 11 16 688 77 27 1 8 762 30 889 35 762 30 889 35 1200 47 1 4 600 23 5 8 688 77 27 1 8 754 29 11 16 22 5 688 77 27 1 8 1200 47 1 4 889 35 762 30 754 29 11 16 400 15 74 e e 22 5 754 29 11 16 ...

Страница 35: ...PAGE 35 37 TRANSPORT ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 16 23 TRANSPORT 3175 125 2400 94 1 2 SIDE VIEW TOP VIEW ...

Страница 36: ...1000 Watts into 8 ohms ALPHA EM ALPHA B1 18 Recommended Amplifiers e SP4 CABLE SP8 CABLE NX241 TDcontroller B1 18 e e e e e e e B1 18 B1 18 B1 18 SP8 CABLE SP8 CABLE SP8 CABLE SP8 CABLE SP8 CABLE SP8 CABLE SP8 CABLE SP4 CABLE SP4 CABLE SP4 CABLE NX241 TDcontroller NX241 TDcontroller NX241 TDcontroller LF LF LF LF HF MF HF MF HF MF HF MF ...

Страница 37: ... CABLE SP8 CABLE SP8 CABLE SP8 CABLE SP8 CABLE SP4 CABLE SP4 CABLE SP4 CABLE SP4 CABLE SP4 CABLE SP4 CABLE SP4 CABLE SP4 CABLE SP4 CABLE SP4 CABLE NX241 TDcontroller NX241 TDcontroller 900 to 1400 Watts into 6 ohms 350 to 500 Watts into 12 ohms ALPHA M3 HF ALPHA B1 18 B1 15 Recommended Amplifiers 650 to 900 Watts into 12 ohms ALPHA M3 MF 1800 to 2400 Watts into 3 ohms ALPHA S2 ...

Страница 38: ...ed input High current drive output stages User LF EQ Enhanced protection facility provided for additional safety margin when extended periods of overload are anticipated As with similar devices the Alpha TDcontroller is intended to be inserted between the Audio source console preamplifier etc and the power amplifier WARNING Sense lines MUST be wired in order to ensure the protection of your system...

Страница 39: ...lifier output The red Pk LED indicates Peak limiter action reducing excessive peak voltage or levels capable of overloading the amplifier II 3 b Protection indicator Yellow LED lighting up indicates that temperature or displacement protections are in action on the relevant channel II 3 c Power LED At the leftmost extremity of the TDcontroller a green LED shows if the unit is powered II 4 Peak Limi...

Страница 40: ...puts Amplifier the wiring of the output XLR is simply pin to pin 1 to 1 etc the polarity of the signal being thus respected if the source connected to the input is also balanced III 4 Output Level Switch The three gain values available are 10 6 0 dB 6dB is the recommended factory setting III 5 Sense inputs The sense inputs of the three channels are arranged on a six pole barrier strip set into the...

Страница 41: ...8 affect the threshold of the SUB protections It is not recommended to increase the threshold Marked as the protections will be lowered In the mid position the speaker protections will be set for normal operation This is the factory set position When turned fully clockwise marked protections will be increased e g this setting should be used where the system is operating under harsh conditions iden...

Страница 42: ...165 Francisco Blvd Suite E2 San Rafael CA 94901 Tel 1 415 482 6600 Fax 1 415 482 6110 Email nexousa aol com UK NEXO limited 9 Lyon Road Walton on Thames Surrey KT12 3PU Tel 44 1932 886 007 Fax 44 1932 886 008 Email info nexo sa com FAR EAST NEXO Far East Ltd 101 Lorong 23 Geyland 06 04 Prosper House Singapore 388399 Tel 65 742 5660 Fax 65 742 8050 Email info nexo sg com ...

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